Limit Images per package

Hello everybody! Please, I would like to know if it is possible to limit a free plan of sending only one image in the ad. I want to limit just so that it is not a premium plan. Is it possible?
Thank you very much!

Do you happen to search the forum ?
This was posted a couple of days ago :

Hello @condorito.fr thanks! I´m sorry for this, I researched, but I ended up looking for wrong terms, I apologize again!

Look here :

Based on this and the code snippet provided in the thread mentioned you should get that right.